MQTT Topic Alias allows users to reduce the possibly long and repeatedly used topic name to a 2-byte integer, so as to reduce the bandwidth consumption when publishing messages.

We will introduce in detail the specific use of the new features of MQTT X v1.7.0, especially how to use MQTT X to test features of MQTT 5.0.

User Properties are the user-defined properties that allow users to add their metadata to MQTT messages to expand more application scenarios.

MQTT 5.0 adds a new feature enhanced authentication, which includes query/response style authentication can implement bi-directional authentication of the client and broker.

Four years after the MQTT 3.1.1 has been released and became the OASIS standard, MQTT 5.0 was released, which is a significant improvement and upgrade.

MQTT 5.0 adds the Response Topic, and defines the interaction process for Request Response. This article will introduce this feature in an easy-to-understand way.

MQTT 5.0 brings many new features, this article will give an introduction to the use of the new feature "flow control" in an easy-to-understand way.

MQTT 5.0 brings many new features, this article will introduce the use of subscription identifier and subscription options, in an easy-to-understand way.

EMQX MQTT 5.0 topic rewrite supports rewriting topic A to topic B, when subscribing topics, publishing messages and unsubscribing in MQTT client according to the rule configured by clients.

The MQTT 5.0 protocol has made some upgrades for part of QoS packet, and the processes of dealing with packets, this article below display some simple introduction about the content of upgrades.

When the simultaneously existing packets in the network link exceeds the limit, that is, the Inflight Window reaches its length limit of the (see `max_inflight`), the EMQX broker will no longer send subsequent packets, but will store these packets in the Message Queue.

Shared subscription is a new feature introduced by MQTT 5.0 protocol, which is equivalent to the load balancing function of subscribers.